The Window menu contains the following items: Cascade, Tile, and any open DLEX file.
The 'Cascade' menu item cascades all the open DLEX files in separate windows.
The 'Tile' menu item tiles all the open DLEX files in separate windows.
[Any Open DLEX Files]
A Window's bottom menu displays a list of all open DLEX files. The DLEX file that is in focus has a, bullet next to it. To select a different DLEX window to be in focus, select a different DLEX file name from the list.